Combined air heater and exhaust manifold for internal-combustion engines



March 10, 1931. R, BI QTWELL 1,795,734

COMBINED AIR HEATER AND EXHAUST MANIFOLD FOR INTERNAL COMBUSTION ENGINES Filed`Apri1 5. 1329 `2 Sheets-Sheet 1 Inventor Attorney March 10,1931. R Ba OTWELL 1,795,734

V COMBINED AIR HEATER AND EXHAQST MANIFOLD FOR INTERNAL COMBUSTION ENGINES Filed April 5, 1929 2 Sheets-Sheet 2 Inventor Patented Mat.` 10,1931 a Y iran vs lrrsrersr `ovl-"Fier:ff.l

RALPHB. erwan, or DETROILMICHIGAN COMBINED Ain HEATER AND -nxHAUsr MANIFOLD FOR INTERNAL-ooiviiius'rIoN [ENGINES v p lApplication medapvrii 5,- i929. seriai n1352374, i, My invention relates toa heater for motor ment `of the invention herein'disclosed withdriven vehicles, in which the hot gases disout'departing from the'spirit of the same." l charged into the exhaust manifold are uti- `In the drawings accompanyingthis'specifilized to heat ai deliveredto' the veliiclebody cation:` v v l Y f e 'for' warming the vehicle when operating in Figure 1 is a fragmentary diagrammatical 5r, coldclimates ;-itbeing adapted also torcon- `elevation with parts in section of an autotract the volume of thehot gases in theex mobile; and its power plant showing my inhaust'manifoldthusl reducing back pressure vention installed therein. f and ythereby indirectly increasing the power Figure 2 is a'longitudinal vertical-sectionalv l0 of the engine, whether employed to heat the vehicle or not. a v A 'i tegral exhaust manifold, showing in eleva- It is well known that auto-motive engineers tionone of the longitudinal heat absorbing have been urging for some timepasty better fins depending from the lwalldividing'the design of the exhaust system of internal com y air heating chamber from the'exhaust mani`- 1'5 bustion engines to Vreduce back pressure, sugfold; 'Y -l a, im gesting that-exhaust manifoldsbe air-cooled a Figure 8 is a horizontal longitudinal secto quickly contract the 'volume ofy the hot tional view talren on or about line 3`3 of gases and thus increase the Vpower of' the Figure 2.1y f a engine, f Figure 4 is a cross-sectional view of the de- 20 It is therefore the primary' r'object ofthe vice taken on or about line 4-4 of Figure 2.

, present invention to increase'the eficiencyof Figure 5 is a' longitudinal vertical sectional Y the heater by increasing the radiatingsur-r view through a modification of the device inview through the heating device 4and the ina;

face over which the exhaust passes that it creasing the area of the exhaust manifold by 1 'may be more particularly adapted `for exu providing a pair of connected chamber/sfiotreniely coldclimates, by quickly absorbing cated respectively above` and below theair 75 j'3 0 vnecessary in very'cold'climates, while siofthe exhaust manifold.

theheat'of the hot gases delivered to theexchamber passage-with' heat absorbing` fins i -haust manifold and thence to the air heatintegral with the partition walls dividing the Ving chamber, j, thereby rapidly lheating the exhaust chambers from the air chamberpas-` cold air to a relatively high temperature sage, extending into the respectivechainbers n y y an A multaneouslyl reducing the` back pressure Figure isa cross-sectionalview takenvon f from the manifold to increase the power of or about line 6-6 of Figure 5. f y

the engine.` A f Y n Referring now` to the'letters of reference v Affurtherobject of the invention is to provvplaced upon the drawings:l .n vide means whereby the delivery of hot air A denotes a motor driven vehicle, its may be'manually `cut olf from the body'of hood, C the engine, D the usual fan` and E 'thevehicle during'warrn weather, withoutin thedash-board of the vehicle. Y any `way minimizing the operation of the .F-Gr indicates a combined exhaust gas means employed to effect a reduction of the manifold andair heater, in which .F1 is the 4o temperature of theexhaust gasespdelivered exhaust, andGr1 the air heating chamberfno into the manifold, for increasing the yeiiicien- Fzare po-rts opening into the exhaust chain-v cy of the engine, bytheelimination of back lb'er,.and F3 is a dischargeoutlet therefrom. pressure, regardless of weatherconditions. An integral partition wall'Grdivides the lith the foregoing and other objects in air heating chamber from the exhaust chaml View which will appear as the description ber or manifold and'serves to quickly trans- 95 proceeds, Vhe invention further resides'in the mittheheat'from the exhaust gases in the 'combination and larrangement of parts and.` lmanifold to the heating chamber that the in the details of'construction hereinafter de! temperature of the air passing through the lscribed andjclaimed, it being understood that latter may be raised.

x changes may be made in the precise ernbo'di-` "G3 indicates a funnel-shaped opening at the 100 Vopen air as desired.

Ftare' a plurality of lins integral'with and depending from the partition wall Gz'into the exhaust chamber F1, to `assist in quickly absorbing the heat of the exhaust gases for transmission through the wall G2 into the partition walls G5 thereby greatly increasing the temperature of the air as it is forced by the fan D through the heating chamber to the body of the vehicle or released to the In the modification shown in Figures and 6, the exhaust manifold F1 isv divided,-the respective chambers Ff being located above v and below the air chamber G1 which is also K and K1 are ports connecting the d ivided` exhaust manifold together at each end.

H denotes a flexible pipe of bellowsdilre form connecting the exhaust end Gri of the heater with a two-way valve l, adapted to control the delivery ofthe heated air into the vehicle, or under the hood B,-thence to the open air.

Having indicated the several parts by reference letters, the constructionv and operation of the device will be readily understood.

lVhen it is necessary to heat the lbody of the vehicle, the two-way valve I, is turned to permit the heated air delivered from the heating chamber to pass into the body of the vehicle. l

The modification shown in Figures 5 and 6 isdesigned more particularly for use in localities wherein the winters are prolonged with very low prevailing temperatures throughout .the season.

Its increased radiating capacity furnishing ample heat for all weather conditions.'V

During warm weather or whenever it is desired to cut off `the supply of heated air to the vehicle, the two-way valve is turned to discharge the heated air under the hood covering the power plant, that it may pass tothe outside air.

. -Noatteinpt has vbeen made to showthe con- VLhicle; and a valve adapted to struction of the two-way valve as such valves are known and their operation well under stood.

lt will be seen however that the present device may be used effectively either in the winter to heat the vehicle, or at any season to quickly contract the volume of the exhaust gases,-thereby reducing back pressure, and thus increasing the power of the engine.

' Having described my invention, what I claim is:

1. A deviceof the character described, comprising a combined exhaust manifold and an airheatiiig chamber, in which the air heating chamber is disposed on top of the exhaust manifold and which is divided from the exhaust manifold by a substantially horizontal partition wall integral with the side walls of the device, the exhaust manifold and said chamber being of substantially the saine width; a plurality of longitudinally disposed partition walls integral with the horizontal partition wall and with the upper Ywall of the air chamber, providing a plurality of narrow longitudinally disposed parallel air passages in the air chamber through which air may pass in narrow unobstructed channels over a relatively large radiating surface; and a plurality of tins integral with and depending downwardly from' the horizontal partition wall into the exhaust manifold, whereby a relatively large radiating surface is provided within the exhaust manifold, adapted to receive the heat of the exhaust gases passing over and between the iins,'and for conducting the same to the horizontal wall and the part-ition walls within'the air chamber, as and foiI the purposes described.

2. fn an internal .combustion engine for a motor driven vehicle, a device of the charac ter described comprising an exhaust manifold andan air heating chamber separated from each other by a substantially horizontal partition wall integral with the side walls of the device,said air heating chamber being of substantiallyt-he same ,width as the width of the 4exhaust manifold and disposed on the latter and divided by a plurality of vertical partition walls spacedapart toprovide continuous, unbroken, narrow air passages over a plural number of heating surfaces extending ythe length ofthe chamber; a plurality of fins depending downwardly from said horizontal partition wall into the exhaust chamber to provide a relatively enlarged radiating sur face within 'the exhaust chamber, whereby the .heat from the exhaust chamber is quickly conducted `to the partition walls and radiated within the air chamber; a flexible pipe con 7 nection between the discharge opening of the air heating chamber and the body of the vecontrol the delivery of the heat-ed air to the vehicle. n

3. A device of the-character.described comprising an exhaust manifold provided with spaced internal longitudinal partitions spaced from the upper and lower walls thereof to provide an interior air chamber and separate exhaust passages above and below the air chamber, the exhaust passages having cornmunication with'each other at each end, said air chamber having spaced longitudinal partitlons forming relatively narrow air passages opening through the ends of the device.

4. A device of the character described com` prising an exhaust manold provided with spaced internal longitudinal partitions spaced y from the upper and lower walls thereof to provide an interiorair chamber and separate exhaustvpassages above and below vrthe air chamberfthe exhaust passages having com-f munication with each other at each end, said air chamber having spaced longitudinal partit-ions formingl relatively narrow air passages opening through the ends of the device, the

exhaust manifold portions having fins projecting into the respective separate *exhaustv chambers. e

In testimony whereof, I sign this specification.

RALPH B. OTWELL. 

